<template>
  <view class="viewport">
    <!-- 推荐封面 -->
    <view class="cover">
      <image :src="bannerPicSrc" />
    </view>
    <!-- tab栏 -->
    <view class="tabs">
      <text
        v-for="item in subTypes"
        :key="item.id"
        class="text"
        :class="{ active: activeId === item.id }"
        @click="activeId = item.id"
      >
        {{ item.title }}
      </text>
    </view>
    <!-- 列表内容 -->
    <scroll-view
      scroll-y
      class="scroll-view"
      v-for="item in subTypes"
      :key="item.id"
      v-show="item.id === activeId"
      @scrolltolower="onLower"
    >
      <view class="goods">
        <navigator
          hover-class="none"
          class="navigator"
          v-for="goods in goodsItems[item.id].items"
          :key="goods.id"
          :url="`/pages/goods/index?id=${goods.id}`"
        >
          <image class="thumb" :src="goods.picture"></image>
          <view class="name ellipsis">{{ goods.name }}</view>
          <view class="price">
            <text class="symbol">¥</text>
            <text class="number">{{ goods.price }}</text>
          </view>
        </navigator>
      </view>
      <view class="loading" v-if="!!item.items">没有更多数据...</view>
      <view class="loading" v-else>正在加载...</view>
    </scroll-view>
  </view>
</template>
<script setup>
import { onLoad } from "@dcloudio/uni-app";
import { ref, computed } from "vue";
import { getRecomendsAPI } from "@/api/home";

const urlMap = {
  1: { title: "特惠推荐", url: "/hot/preference" },
  2: { title: "爆款推荐", url: "/hot/inVogue" },
  3: { title: "一站买全", url: "/hot/oneStop" },
  4: { title: "新鲜好物", url: "/hot/new" },
};
const bannerPicSrc = ref("");
const subTypes = ref([]);
const activeId = ref("");
const goodsItems = ref({});
let url = "";

onLoad(async ({ type }) => {
  uni.setNavigationBarTitle({ title: urlMap[type].title });
  url = urlMap[type].url;
  const { result } = await getRecomendsAPI(url);
  // 4. 保存数据
  bannerPicSrc.value = result.bannerPicture;
  subTypes.value = result.subTypes;
  activeId.value = subTypes.value[0].id;
  result.subTypes.forEach((item) => {
    goodsItems.value[item.id] = item.goodsItems;
  });
});

const currentData = computed(() => {
  return goodsItems.value[activeId.value];
});
const onLower = async () => {
  if (currentData.value.page >= currentData.value.pages) {
    uni.showToast({ title: "没有更多数据了", icon: "none" });
    return;
  }
  const pageParams = {
    subType: activeId.value,
    pageSize: 10,
    page: currentData.value.page + 1,
  };
  // 到底了请求下一页数据
  const { result } = await getRecomendsAPI(url, pageParams);
  const newGoods = result.subTypes.find(
    (item) => item.id == activeId.value
  ).goodsItems;
  goodsItems.value[activeId.value].items = [
    ...goodsItems.value[activeId.value].items,
    ...newGoods.items,
  ];
  // 页码++
  goodsItems.value[activeId.value].page++;
};
</script>

<style lang="scss">
page {
  height: 100%;
  background-color: #f4f4f4;
}
.viewport {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 180rpx 0 0;
  position: relative;
}
.cover {
  width: 750rpx;
  height: 225rpx;
  border-radius: 0 0 40rpx 40rpx;
  overflow: hidden;
  position: absolute;
  left: 0;
  top: 0;
}
.tabs {
  display: flex;
  justify-content: space-evenly;
  height: 100rpx;
  line-height: 90rpx;
  margin: 0 20rpx;
  font-size: 28rpx;
  border-radius: 10rpx;
  box-shadow: 0 4rpx 5rpx rgba(200, 200, 200, 0.3);
  color: #333;
  background-color: #fff;
  position: relative;
  z-index: 9;
  .text {
    margin: 0 20rpx;
    position: relative;
  }
  .active {
    &::after {
      content: "";
      width: 40rpx;
      height: 4rpx;
      transform: translate(-50%);
      background-color: #27ba9b;
      position: absolute;
      left: 50%;
      bottom: 24rpx;
    }
  }
}
.scroll-view {
  flex: 1;
  overflow: hidden;
}
.goods {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  padding: 0 20rpx 20rpx;
  .navigator {
    width: 345rpx;
    padding: 20rpx;
    margin-top: 20rpx;
    border-radius: 10rpx;
    background-color: #fff;
  }
  .thumb {
    width: 305rpx;
    height: 305rpx;
  }
  .name {
    height: 88rpx;
    font-size: 26rpx;
  }
  .price {
    line-height: 1;
    color: #cf4444;
    font-size: 30rpx;
  }
}
.goods .symbol,
.goods .decimal {
  font-size: 70%;
}
</style>